Chugaievska, Svitlana, Nataliia Chugaievska, and Tomasz Tokarski. “Statistical Analysis of the Influence of Gravity Effect on Spatial Differentiation of Economic Development of Ukraine”. DEMO 2, no. 2 (December 30, 2017): 72–95. Accessed November 1, 2024. https://ojs.fimagis.pl/demo/article/view/1094.